Opera



(No Model.)

- G. H EATONi OPERA, FIELD, 0R MARINE GLASS. No. 381,347. Patented Apr. 17, 1888."

ZO'Ms-ses i f n. rams. mwmmw, wahin ton. ma

1 in adjusted position.

UNITED S ATES.

GEORGE H. EATON, or BosromMAssAonUs rTs.

PATENT f omen.

X -OPER'A,IFI;ELD, OR MARINE GLASS,

SPECIFICATION forming part of Letters Patent No. 381,857 dated April l'7, 1888. i I

Application filed Novembergl, 1887. Serial No. 255,776. (No model.)

To aZZ whom if mayconcern:

ters on the drawings representing like parts.

This invention has for its object to construct an opera-glasswhich may be collapsed to cocupy very small space.

1n accordancewith this invention the two lens-holding plates are joined one to the other by spiral springs, thenornial tendency of which is to move the two lens-holding plates from each other. The spiral springs are en-. veloped or inclosed by a suitable textile or flexible covering. The glass is provided with an adjusting device, preferably detachable, byv

which the two lens holding plates may beadjustedwith relation to each other'and be held The adjusting device referred to is herein shown as a rod or bar adapted to pass through an opening in one of the lens-holding plates and to engage the other of the said plates, the said'rod or bar having a key or spline to prevent its rotation, and also having a series of diagonal teeth which are engaged by a spirally toothed wheel, the rotation of which. actuates the rod or bar to move the two lens-holding plates. toward or from each other.

Figure 1 showsin elevation and partial section an opera-glass embodying-thisinvention; Fig. 2, a vertical section of the opera-glass taken on thedottedlinesw m, Fig. 1; and Figs. 3, 4, and 5, details of the adjustingdevice to be referred to.

The plate a, of suitable shape and having openings to receive the eye-lenses a, and the,

plate I), of suitable shape and having openings'to receive the lenses b, are joinedone to the other by spiral springs 0 c, the normal tendency of which is to move the two lensholding plates a b from each other. Each spi ral spring 0 c is enveloped or inclosed in a suitable textile or flexible covering or casing,

' d, which may be attached to the successive convolutions of. the spring.

ing device, herein shown as'a rod or bar, e,

and the lens-holding plate a is provided with V a socket, e, which'receives the end. of the'rod e. The rod 6 is provided with a key or spline,

,e", which enters an opening or passage com municatin'g with the rod receiving opening, in the lens-holding plateb, to thereby prevent rotation of the rod, but permit of a vertical I '60 its upper end outside of the socket e, and I movement only. The, key 6 is extended. at

such extension is provided at itsinner side with-a series of teeth,.as at a (see Fig. 2,)

- opening in the lower end of the socket e, for

the purpose of preventing rotationof thesaid rod. The rod e, or, as herein shown, the key e of said rod, is provided at its lowercend with a series of diagonal teeth, 0, (see Figs, 2 and 5,) which are engaged by a spirally-toothed wheehf, pivotally connected with the lens-- holding plate I) by a screw or stud, f, rotation of the said spirally-toothed wheel f effecting a vertical movement of the rod 6, to thereby-" move the lens-holding plates a 1) toward and fromeach other.

It will be seen that by rotating lens-holding plates at any desired distance a v p 4 the wheel f the rod 0 may be moved to adjust and holdthe contiguous to each other,occupying' very small space, so that the glass may be carried in the pocket much easier than ordinary operaglasses known to me,

. I do not desire to limit my invention to the particular form or construction of adjusting i device, as it is obvious the samemay be modi fied somewhat and yet contain the principal features of this invention. r 1 .7

The invention is also applicable to field and marine glasses, so that I do myself to opera-glasses.

Iclaim I I 1. In an opera, field, ormarine glass, the

not desire to limit two lens-holding plates a b, combined with two spiral springs, as c 0, one end of each spring being connected with one of the lens-holding plates, and the opposite end of each spring connected with the other lens-holding plate, and a covering for said springs, substantially as described.

2. In an opera,field, or marine glass, the two lens-holding plates a b and two spiral springs, c 0, attached at each end to the lens-holding plates, combined with the rod 0, adapted to engage one of the lens-holding plates, and made movable through the other, and means, substantially as described, for moving the said rod 6 inthe direction of its length only, as and for the purpose set forth. 

